Combined sonic/pulsed neutron cased hole logging tool

ABSTRACT

A through casing formation evaluation tool string  1000, 2000, 3000  including a conveyance string  100 , a sonic array tool  200 , a pulsed neutron tool  400  and one or more downhole memory modules  160, 540, 550 . A method of through casing formation evaluation and casing and cementing integrity evaluation includes lowering a tool string into a cased wellbore; concurrently collecting data with the sonic array tool and pulsed neutron tool and transmitting at least a portion of the collected data via a conveyance string to a CPU located at the surface of the earth; storing a portion of the collected data in a memory module disposed in the tool string; removing the tool string from the wellbore; processing the collected data in the CPU to obtain selected rock property data about the one or more of the geologic formations and/or cement integrity.

CLAIM OF PRIORITY

This application claims priority under 35 USC §365(c) to InternationalPatent Application Serial No. PCT/US2010/049146, entitled “CombinedSonic/Pulsed Neutron Cased Hole Logging Tool”, filed on Sep. 16, 2010,which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

This disclosure relates to formation and casing evaluation tools andmethods of formation evaluation, and more particularly a combinationsonic and pulsed neutron tool for formation evaluation through casing,and casing and cementing integrity evaluation and methods for use forsame.

BACKGROUND

In many reservoirs throughout the world it is necessary to hydraulicallyfracture the reservoir to produce commercial quantities of oil and gas.In order to design such hydraulic fracture stimulation treatments it isdesirable to understand the in-situ stress profiles. To calculate thein-situ stress profile it is desirable to have mechanical rockproperties and pore pressure data in and around the target producingzones of the reservoir. Previously, it was necessary to obtain much ofthe needed data used in the stimulation designs with logs run in an openhole environment, while the well was being drilled, or in open holelogging runs after the desired interval had been penetrated and beforecasing had been placed in the wellbore. Obtaining the data in an openhole environment while the drilling rig is on location results in thewell operator incurring the cost of the drilling rig time while thelogging operation is conducted. Additionally, it is sometimes necessaryto remove the drill string and bit and then rerun the drill string andbit to the bottom of the hole and remove it again (aka “make a wipertrip in and out of the hole”) to circulate and condition the drillingfluids (aka “drilling mud”) to prepare the open hole for formationevaluation tools. This conditioning of the open hole results inadditional costs for the drilling fluids and additional rig time costs.Use of an open hole formation evaluation tool (aka “open hole logging”)has some risks. In highly deviated and/or horizontal wells it issometimes difficult to get the open hole formation evaluation tools (aka“logging tools”) to the portion of the wellbore in the desired geologicintervals, necessitating additional rig time and expense. It is alsopossible that the logging tools may become stuck in the wellbore whichmay necessitate expensive retrieval operations (aka “fishingoperations”) to retrieve the stuck logging tools. If the logging toolsare not able to be retrieved, it may be necessary to drill a replacementportion for the wellbore or even abandon the wellbore and drill a newwell.

A need exists for obtaining formation evaluation data (aka “log data”)to be used in wellbore design and hydraulic fracture stimulation designin an alternative manner to open hole logging. A further need exists fora cased hole combination logging tool for use in analyzing casing(s) andcement integrity in a well bore.

SUMMARY

The present disclosure provides an alternative through casing formationevaluation tool to open hole formation evaluation tools by combiningpulsed neutron and sonic technology in a mono-cable format for use in asingle cased hole logging run. This is an efficient and cost savingapproach to obtaining the desired formation evaluation data (aka “logdata”) for well design and hydraulic stimulation design and for a casedhole combination logging tool for use in analyzing casing(s) and cementintegrity in a wellbore. Since the wellbore is cased, the drilling rigmay be removed before a logging run using the tool of the presentdisclosure, and therefore considerable money is saved by avoiding therig time incurred during open hole logging. The combined tool and methodof the present disclosure also saves money by making only a single casedhole logging trip versus several trips necessary to obtain the datausing individual tools each in a single logging run. Risk of losinglogging tools in the well is minimized by using cased hole loggingversus open hole logging. It is generally easier to get the loggingtools to the desired geologic zones in a cased hole as opposed to anopen hole, especially in highly deviated or horizontal wellbores. Riskof losing tools in a cased hole is minimized by using a single loggingrun with the combination tool in the cased hole instead of multiple runswith single tools.

The data obtained with the combined tool of the present disclosureprovides formation measurements through casing(s) and cement. The toolsmay obtain data on casing(s) string and cement integrity; fluidssaturations and rock properties of the reservoir; including DTC(compressional slowness); DTS (shear slowness); minimum horizontalstress profile; porosity; simple mineralogy; matrix sigma; pseudodensity; and full wave information. The robustness of the gathered datais useful for optimal well design and for improved hydraulic fractureand acidization stimulation design and placement used in completing andstimulating the well and for determining the integrity of one or morecasing strings and cement in the wellbore.

In some embodiments, the combined tool string may be less than 3 inchesin outside diameter, thereby allowing for ease of conveyance of the toolstring in small internal diameter cased wellbores, tubing, drill pipeand within highly deviated and horizontal wellbores (aka “high dog leg”severity).

The combined pulsed neutron and sonic cased hole formation evaluationmay be accomplished in several ways: real time gathered data transmittedvia an electrical or fiber optic cable, or wired continuous rod; memorymode by storing a portion of the gathered data in memory module(s) inthe tool string and conveyed on above cables or slickline or wiredcontinuous rod; and in a hybrid telemetry method where a portion of thegathered data is transmitted via an electrical or fiber optic cable orcontinuous wired rod and a portion of the gathered data is stored in thememory modules(s) in the tool string and retrieved when the tool stringis removed from the wellbore.

The collected data is processed in a CPU at the surface to obtain morerobust rock property data about the one or more geologic formations. Therock properties are selected from the group consisting of Poisson'sRatio, Young's Modulus, compression slowness, shear slowness, minimumhorizontal stress profile and inelastic measurements leading to simplemineralogy and matrix sigma (Spwla_(—)2009_T), Sigma (or capturecross-section) and ratio measurement for porosity (SPE30597) and pseudodensity (SPE94716). The robustness of the processed rock property datais useful for optimal well design and for improved hydraulic fractureand acidization stimulation design and placement used in completing andstimulating the well and for determining the integrity of one or morecasing strings and cement in the wellbore.

The details of one or more embodiments of the invention are set forth inthe accompanying drawings and the description below. Other features,objects, and advantages of the invention will be apparent from thedescription and drawings, and from the claims.

DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic of a first implementation of a combination sonicand pulsed neutron tool for formation evaluation through casing;

FIG. 2 is a schematic of a second implementation of a combination sonicand pulsed neutron tool for formation evaluation through casing;

FIG. 3 is a schematic of a third implementation of a combination sonicand pulsed neutron tool for formation evaluation through casing; and

FIG. 4 is a functional schematic of possible combinations of theelements of a combination sonic and pulsed neutron tool and system.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

Referring now to FIG. 1, wherein there is illustrated a schematic of afirst embodiment of the combination logging tool string 1000 for useinside of a cased wellbore. The logging tool string 1000 is conveyedinto the wellbore on a conveyance string 100 which may include one ormore of the following: an electric and/or fiber optic cable 101; aslickline cable 102; a wired conveyance rod 103; coiled tubing string104; and a wired coiled tubing string (including electrical cable and/orfiber optics) 105. The tool string 1000 includes: a gamma ray/casingcollar telemetry module 110 connected to a first crossover tool 112. Asecond crossover tool 114 may be used to connect the first crossovertool to a first end 210 of a sonic array tool 200. The sonic array toolmay include centralizers 230. A third crossover tool 116 may be used toconnect a lower end 220 of the sonic array tool to a flexible sub 300(aka “serpentine or knuckle joint”) that allows decoupling of acentralized tool. A pulsed neutron tool 400 may be connected at a firstend 410 to a second end of the flexible sub 300. In some embodiments, inthe tool string 1000, the sonic array tool 200 is disposed above theflexible sub 300 and the pulsed neutron tool 400 is disposed below theflexible sub. Alternatively, the pulsed neutron tool 400 may be disposedabove the flexible sub 300 and the sonic array tool 200 may be disposedbelow the flexible sub 300. If the pulsed neutron tool 400 is below thesonic tool 200, a crossover tool 116 may be used to receive either atermination bull plug 119 at the lower end of the tool string or,alternatively, an additional crossover 120 may be attached to crossover116 to connect to additional tools (not shown) that may be used in thestring 1000. If the sonic tool 200 is positioned below the neutron tool400, then a crossover tool 118 may be used to receive either atermination bull plug 119 at the lower end of the tool string 1000 or,alternatively, an additional crossover 120 may be attached to crossover118 to connect to additional tools (not shown) that may be used in thestring 1000.

By way of example, a Halliburton mono-cable telemetry module model 1553may be used in combination with Halliburton's slim bore hole sonic arraytool (SBSAT) and Halliburton's pulsed neutron tool model RMT-i or TMD-3d(1553). The flexible sub 300 may be Halliburton's 6-6 flex connector. Itwill be understood that other telemetry modules and sonic array toolsand neutron tools and flexible subs manufactured and provided byHalliburton and/or other third parties may be used in implementations ofthe present disclosure.

By way of further explanation, the present disclosure as discussed abovemay use a continuous wired rod (103) that includes the features ofencapsulating fiber optic and/or copper wire within a smooth, round semirigid outer layer(s). The rigidity of the continuous wired rod may allowpushing/pulling tool strings, possibly eliminating mechanical tractors.

Referring now to FIG. 2, wherein there is illustrated a schematic of analternative implementation of the combination logging tool string 2000for use inside of a cased wellbore. The logging tool string 2000 isconveyed into the wellbore on a conveyance string 100 which may includeone or more of the following: an electric and/or fiber optic cable 101;a slickline cable 102; a wired conveyance rod 103 (see discussionhereinafter); coiled tubing string 104; and a wired coiled tubing string(including electrical cable and/or fiber optics) 105. The tool string2000 includes: a memory module 150 which is connected to a crossovertool 114. The memory module is connected to a first end 210 of a sonicarray tool 200. A crossover tool 116 may be used to connect the lowerend 220 of the sonic array tool to a flexible sub 300. A pulsed neutrontool 400 is connected at a first end 410 to a second end of the flexiblesub 300. In some embodiments in the tool string 1000, the sonic arraytool 200 is disposed above the flexible sub 300 and the pulsed neutrontool 400 is disposed below the flexible sub 300. Alternatively, thepulsed neutron tool 400 may be disposed above the flexible sub 300 andthe sonic array tool 200 may be disposed below the flexible sub 300. Ifthe pulsed neutron tool 400 is below the sonic tool 200, a crossovertool 116 may be used to receive either a termination bull plug 119 atthe lower end of the tool string or, alternatively, an additionalcrossover 120 may be attached to crossover 116 to connect to additionaltools (not shown) that may be used in the string 2000. If the sonic tool200 is positioned below the neutron tool 400, then a crossover tool 118may be used to receive either a termination bull plug 119 at the lowerend of the tool string or, alternatively, an additional crossover 120may be attached to crossover 118 to connect to additional tools (notshown) that may be used in the string 2000.

Referring now to FIG. 3, wherein is illustrated a schematic of analternative implementation of a combination logging tool string 3000.The alternative tool string 3000 is similar to the first embodiment ofthe combination logging tool string 1000 for use inside of a casedwellbore. The tool string 3000 is conveyed into the wellbore on aconveyance string 100 which may include one or more of the following: anelectric and/or fiber optic cable 101; a slickline cable 102; a wiredconveyance rod 103 or coiled tubing string 104; a wired coiled tubingstring (including electrical cable and/or fiber optics) 105. The toolstring 3000 may include: a gamma ray/casing collar telemetry module 110which is connected to a first crossover tool 112. A second crossovertool 114 may be used to connect the first crossover tool to a first end210 of a sonic array tool 200. A third crossover tool 116 may be used toconnect the lower end 220 of the sonic array tool to a flexible sub 300.A pulsed neutron tool 400 is connected at a first end 410 to a secondend of the flexible sub 300. In some embodiments in the tool string1000, the sonic array tool 200 is disposed above the flexible sub 300and the pulsed neutron tool 400 is disposed below the flexible sub 300.Alternatively, the pulsed neutron tool 400 may be disposed above theflexible sub 300 and the sonic array tool 200 may be disposed below theflexible sub 300. The alternative tool string 3000 further includes amemory module 150 connected to the sonic array tool 200 and may includea second memory module 150 connected to the pulsed neutron tool 400. Ifthe pulsed neutron tool 400 is below the sonic tool 200, a crossovertool 116 may be used to receive either a termination bull plug 119 atthe lower end of the tool string or, alternatively, an additionalcrossover 120 may be attached to crossover 116 to connect to additionaltools (not shown) that may be used in the string 2000. If the sonic tool200 is positioned below the neutron tool 400, then a crossover tool 118may be used to receive either a termination bull plug 119 at the lowerend of the tool string 3000 or, alternatively, an additional crossover120 may be attached to crossover 118 to connect to additional tools (notshown) that may be used in the string 3000.

Referring to FIG. 4, there is illustrated a functional schematic ofpossible combinations of the elements of a formations evaluation system500. The system may include a CPU 510 located at the surface. A monoconductor 512 may be used to transmit data up or down the mono-cable toor from the formations evaluation tools comprising the tool string whenthe tool string is lowered into a cased wellbore. The mono-cable isconnected to a telemetry module 514. A downhole tool bus 530 is includedin the tool string. A gamma ray casing collar module 520 may be includedin the string. A pulsed neutron module 522 and a sonic array module 524may be included as is illustrated in section 570 of the system. In ahybrid embodiment 580, memory bank modules 540 may receive and storedata from one or more of the gamma ray/casing collar tool 520, thepulsed neutron tool 522, and the slim array sonic tool 524;alternatively, an additional memory bank module 550 may be included inthe tool string system 500 to receive and store data from one or more ofthe gamma ray/casing collar tool 520, the pulsed neutron tool 522, andthe slim array sonic tool 524. The tool string may further include abattery pack and a memory CPU module 560.

The tool string 1000, as previously described, may be assembled byconnecting a conveyance string 100 to a gamma ray/casing collartelemetry module 110; connecting a flexible sub 300 at first end to asonic array tool 200; connecting a pulsed neutron tool 400 at a secondend of the flexible sub. Alternatively, the pulsed neutron tool 400 maybe disposed above the flexible sub 300 and the sonic array tool 200 maybe disposed below the flexible sub 300. In operation, the tool string islowered into the cased wellbore via the electric mono-cable. The toolstring is passed inside the well casing across one or more geologicformations which are outside the wellbore casing. Data is collected withthe sonic array tool and the pulsed neutron tool and transmitted via theelectric mono-cable to a CPU 510 located at the surface of the earth.The collected data is processed to obtain selected rock property dataabout the one or more geologic formations. The rock properties areselected from the group consisting of Poisson's Ratio, Young's Modulus,compression slowness, shear slowness, minimum horizontal stress profile,porosity, simple mineralogy, matrix sigma, and pseudo density.Additionally, the tool string 1000 may gather data for determining theintegrity of one or more casing strings and cement in the wellbore. Thepulsed neutron log may gather data on gas effect and fluid flow behindand between casing strings. The sonic tool may gather data on the cementbond between the casing and the cement and the cement and the formation.

The tool string 2000, as previously described, may be assembled byconnecting a slickline 102 or coiled tubing string 104 to a sonic arraytool 200. The flexible sub 300 is connected at one end to the sonicarray tool 200 and at a pulsed neutron tool 400 at a second end of theflexible sub. Alternatively, the pulsed neutron tool 400 may be disposedabove the flexible sub 300 and the sonic array tool 200 may be disposedbelow the flexible sub 300. In operation, the tool string 2000 islowered into the cased wellbore via the slickline or coiled tubingstring. The tool string is passed inside the well casing across one ormore geologic formations outside of the cased wellbore. Data iscollected with the sonic array tool and the pulsed neutron tool andstored in the memory module(s) 150. The tool string 2000 is removed fromthe wellbore and the collected data is retrieved from the memory module150 and processed to obtain selected rock property data about the one ormore geologic formations. The rock properties are selected from thegroup consisting of Poisson's Ratio, Young's Modulus, compressionalslowness, shear slowness, minimum horizontal stress profile, porosity,simple mineralogy, matrix sigma, and pseudo density. Additionally, thetool string 2000 may gather data for determining the integrity of one ormore casing strings and cement in the wellbore. The pulsed neutron logmay gather data on gas effect and fluid flow behind and between casingstrings. The sonic tool may gather data on the cement bond between thecasing and the cement and the cement and the formation.

A hybrid tool string 3000 may be assembled by connecting a conveyancestring 100 to a gamma ray/casing collar telemetry module 110; connectinga flexible sub 300 at first end to a sonic array tool 200; connecting apulsed neutron tool 400 at a second end of the flexible sub. A firstmemory module 150 may be connected to the pulsed neutron tool 400. Ifdesired, a second memory module 150 may be connected to the sonic tool200. Alternatively, the pulsed neutron tool 400 may be disposed abovethe flexible sub 300 and the sonic array tool 200 may be disposed belowthe flexible sub 300. In operation, the tool string 3000 is lowered intothe cased wellbore via the electric mono-cable. The tool string ispassed inside the casing across one or more geologic formations outsideof the cased wellbore. Data is collected with the sonic array tool andthe pulsed neutron tool and all or a portion of the collected data istransmitted via the electric mono-cable to a CPU 510 located at thesurface of the earth. A portion of the collected data may be stored inthe memory module(s) 150. The tool string is removed from the wellboreand the collected data is processed in combination with the datatransmitted to the surface via the mono-cable to obtain selected rockproperty data about the one or more geologic formations. The rockproperties are selected from the group consisting of Poisson's Ratio,Young's Modulus, compressional slowness, shear slowness, minimumhorizontal stress profile, porosity, simple mineralogy, matrix sigma,and pseudo density. Additionally, the tool string 300 may gather datafor determining the integrity of one or more casing strings and cementin the wellbore. The pulsed neutron log may gather data on gas effectand fluid flow behind and between casing strings. The sonic tool maygather data on the cement bond between the casing and the cement and thecement and the formation.

During operations of the combined tool string 1000, 2000, and 3000, datamay be gathered simultaneously in one pass across the geologicformations by the sonic array tool 200 and the pulsed neutron tool 400.Alternatively, data may be gathered selectively by either the pulsedneutron tool 400 or the sonic array tool 2000 as the tool string 1000,2000, and 3000 is passed one or more times across the selected geologicformation.

During operations of the combined tool string 1000, 2000, and 3000, dataon the casing and cement integrity may be gathered simultaneously in onepass across the casing by the sonic array tool 200 and the pulsedneutron tool 400. Alternatively, data may be gathered selectively byeither the pulsed neutron tool 400 or the sonic array tool 2000 as thetool string 1000, 2000, and 3000 is passed one or more times across theselected casing interval.

A number of implementations have been described. Nevertheless, it willbe understood that various modifications may be made. Accordingly, otherimplementations are within the scope of the following claims:

What is claimed is:
 1. A through casing formation evaluation tool, saidtool comprising: a conveyance string; and a tool string including: asonic array tool and a pulsed neutron tool adapted to concurrentlycollect data about one or more geologic formations located adjacent to awellbore casing wall.
 2. The formation evaluation tool of claim 1further including a flexible sub connected at a first end to the sonicarray tool and a second end of the flexible sub connected to a pulsedneutron tool.
 3. The formation evaluation tool of claim 1 wherein thetool string further includes at least one memory module.
 4. Theformation evaluation tool of claim 1 wherein the tool string furtherincludes a memory module connected to the sonic array tool.
 5. Theformation evaluation tool of claim 1 wherein the tool string furtherincludes a memory module connected to the pulsed neutron tool.
 6. Theformation evaluation tool of claim 1 further including a gammaray/casing collar locator.
 7. The tool of claim 1 wherein the conveyancestring includes at least one of an electrical wireline cable, a fiberoptic cable, a slickline, a coiled tubing string, a wired coiled tubingstring and a continuous wired rod.
 8. The tool of claim 1 wherein thetool further gathers data that is processed in a CPU to determine casingand/or cement integrity.
 9. A method of through casing formationevaluation comprising: inserting a conveyance string with a tool stringconnected thereto into a cased wellbore having a wellbore casing walldisposed adjacent one or more geologic formations, said tool stringcomprising a sonic array tool, and a pulsed neutron tool; passing thetool string inside the wellbore casing across the one or more geologicformations located outside of and adjacent the wellbore casing wall;concurrently collecting data through the wellbore casing wall about theone or more geologic formations located adjacent to the wellbore casingwall with the sonic array tool and the pulsed neutron tool andtransmitting the collected data via the conveyance string to a CPUlocated at the surface of the earth; and processing the collected datafrom both the sonic array tool and the pulsed neutron tool to obtainselected rock property data about the one or more of the geologicformations.
 10. The method of claim 9 wherein data is gatheredsimultaneously in one pass across the geologic formations by the sonicarray tool and the pulsed neutron tool.
 11. The method of claim 9wherein data is gathered selectively by either the pulsed neutron toolor the sonic array tool as the tool string is passed one or more timesacross selected geologic formations.
 12. A method of through casingformation comprising: inserting a conveyance string with a tool stringconnected thereto into a cased wellbore, said tool string comprising atleast one memory module, a sonic array tool, and a pulsed neutron tool;passing the tool string across one or more geologic formations locatedoutside of and adjacent to a wellbore casing wall of the cased wellbore;concurrently collecting data through the casing wall with the sonicarray tool and the pulsed neutron tool about the one or more geologicformations located adjacent to the wellbore casing wall and storing thedata in the memory module; removing the tool string from the wellbore;loading the collected data stored in the at least one memory module in aCPU located at the surface of the earth; and processing the collecteddata from both the sonic array tool and the pulsed neutron tool in a CPUlocated at the surface of the earth to obtain selected rock propertydata about the one or more geologic formations.
 13. The method of claim12 wherein data is gathered simultaneously in one pass across thegeologic formations by the sonic array tool and the pulsed neutron tool.14. The method of claim 12 wherein data is gathered selectively byeither the pulsed neutron tool or the sonic array tool as the toolstring is passed one or more times across selected geologic formations.15. A method of through casing formation evaluation comprising:inserting a conveyance string with a tool string connected thereto intoa cased wellbore, said tool string comprising a sonic array tool and apulsed neutron tool and at least one memory module; passing the toolstring inside the wellbore casing across one or more geologic formationslocated outside of and adjacent to a wellbore casing wall; concurrentlycollecting data through the casing wall with the sonic array tool andthe pulsed neutron tool about the one or more geologic formationslocated outside of and adjacent to the wellbore casing wall andtransmitting at least a portion of the collected data via the conveyancestring to a CPU located at the surface of the earth; storing at least aportion of the collected data in the at least one memory module;removing the tool string from the wellbore; loading the collected datastored in the at least one memory module in a CPU located at the surfaceof the earth; and processing the collected data from both the sonicarray tool and the pulsed neutron tool in the CPU located at the surfaceof the earth to obtain selected rock property data about the one or moregeologic formations.
 16. The method of claim 15 wherein data is gatheredsimultaneously in one pass across the geologic formations by the sonicarray tool and the pulsed neutron tool.
 17. The method of claim 15wherein data is gathered selectively by either the pulsed neutron toolor the sonic array tool as the tool string is passed one or more timesacross selected geologic formations.
 18. The method of claim 9 whereinthe conveyance string includes at least one of an electrical wirelinecable; a fiber optic cable; a slickline; a coiled tubing string; a wiredcoiled tubing string; and a continuous wired rod.
 19. The method ofclaim 9 wherein the rock property is selected from the group consistingof Poisson's Ratio, Young's Modulus, compressional slowness, shearslowness, minimum horizontal stress profile, porosity, simplemineralogy, matrix sigma, and pseudo density.
 20. The method of claim 9further including: passing the tool string inside the wellbore casingacross at least one selected cased hole interval; collecting data withthe sonic array tool regarding cement bond and the pulsed neutron toolregarding at least one of gas effect or fluid flow outside a wellborecasing wall proximal to the at least one cased hole interval andtransmitting the collected data via the conveyance string to a CPUlocated at the surface of the earth; and processing the collected datafrom both the sonic array tool and the pulsed neutron tool to obtainselected data for determining casing and cement integrity about the atleast one selected cased hole interval.
 21. The method of claim 15further including: passing the tool string inside the wellbore casingacross at least one selected cased hole interval; collecting data withthe sonic array tool regarding cement bond and the pulsed neutron toolregarding at least one of gas effect or fluid flow outside a wellborecasing wall proximal to the at least one cased hole interval and storinga portion of the collected data in the at least one memory moduledisposed in the tool string; removing the tool string from the wellbore;loading the collected data stored in the at least one memory module in aCPU located at the surface of the earth; and processing the collecteddata from both the sonic array tool and the pulsed neutron tool in theCPU located at the surface of the earth to obtain selected data fordetermining casing and cement integrity about the at least one selectedcased hole interval.